<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

<script>
	obj.prototype.param1 = 1;
	obj.prototype.fun = function (v){
		alert(v);
	}
	var o = new obj();
	alert(o.param1);
	o.fun(10);
</script>
</body>
</html>